我们正在尝试使用 c3p0 实现连接池。问题是当我们的服务器长时间没有事务时，下一个事务的第一个事务就会出现连接超时问题。
异常堆栈跟踪:
Could not open JPA EntityManager for transaction; nested exception is javax.persistence.Pers
istenceException: org.hibernate.TransactionException: JDBC begin transaction failed:
org.springframework.transaction.CannotCreateTransactionException: Could not open JPA EntityManager for transacti
on; nested exception is javax.persistence.PersistenceException: org.hibernate.TransactionException: JDBC begin t
ransaction failed:
at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:431)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPla
tformTransactionManager.java:373)
at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(Tra
nsactionAspectSupport.java:427)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(Transact
ionAspectSupport.java:276)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java
:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:
179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
at com.sun.proxy.$Proxy559.getMerchantById(Unknown Source)
at com.ag.controller.MerchantController.getMerchantById(MerchantController.java:1111)
at com.ag.controller.MerchantController.checkoutMerchant(MerchantController.java:226)
at sun.reflect.GeneratedMethodAccessor1766.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:22
1)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod
.java:137)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(S
ervletInvocableHandlerMethod.java:111)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMetho
d(RequestMappingHandlerAdapter.java:806)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(Req
uestMappingHandlerAdapter.java:729)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodA
dapter.java:85)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:
85)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at com.ag.configuration.XSSFilter.doFilter(XSSFilter.java:27)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:522)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1095)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
Caused by: javax.persistence.PersistenceException: org.hibernate.TransactionException: JDBC begin transaction fa
iled:
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1763)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1677)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.j
ava:1771)
at org.hibernate.jpa.internal.TransactionImpl.begin(TransactionImpl.java:64)
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.beginTransaction(HibernateJpaDialect.java:166)
at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:380)
... 53 more
Caused by: org.hibernate.TransactionException: JDBC begin transaction failed:
at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.doBegin(JdbcTransaction.java:76)
at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.begin(AbstractTransactionImpl.java:162)
at org.hibernate.internal.SessionImpl.beginTransaction(SessionImpl.java:1435)
at org.hibernate.jpa.internal.TransactionImpl.begin(TransactionImpl.java:61)
... 55 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from t
he server was 54,078,423 milliseconds ago. The last packet sent successfully to the server was 54,078,423 milli
seconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring a
nd/or testing connection validity before use in your application, increasing the server configured values for cl
ient timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:400)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1038)
at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3621)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2429)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2594)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2541)
at com.mysql.jdbc.ConnectionImpl.setAutoCommit(ConnectionImpl.java:4882)
at com.mchange.v2.c3p0.impl.NewProxyConnection.setAutoCommit(NewProxyConnection.java:912)
at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.doBegin(JdbcTransaction.java:72)
... 58 more
Caused by: java.net.SocketException: Connection timed out
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:109)
at java.net.SocketOutputStream.write(SocketOutputStream.java:153)
at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)
at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3603)
... 64 more
数据源配置:
@Primary
@Bean
public DataSource agDataSource() {
ComboPooledDataSource dataSource = new ComboPooledDataSource();
try {
dataSource.setDriverClass(Preconditions.checkNotNull(environment.getRequiredProperty("hibernate.connection.driver_class")));
} catch (IllegalStateException | PropertyVetoException e) {
e.printStackTrace();
}
dataSource.setJdbcUrl(Preconditions.checkNotNull(environment.getRequiredProperty("hibernate.connection.url")));
dataSource.setUser(Preconditions.checkNotNull(environment.getRequiredProperty("hibernate.connection.username")));
dataSource.setPassword(Preconditions.checkNotNull("hibernate.connection.password"));
}
@Primary
@Bean(name="agEntityManagerFactory")
public LocalContainerEntityManagerFactoryBean agEntityManagerFactory() throws ClassNotFoundException {
final LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
entityManagerFactoryBean.setDataSource(agDataSource());
entityManagerFactoryBean.setPackagesToScan(new String[] { "com.ag.entities" });
entityManagerFactoryBean.setPersistenceProviderClass(HibernatePersistenceProvider.class);
final HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
vendorAdapter.setShowSql(true);
entityManagerFactoryBean.setJpaVendorAdapter(vendorAdapter);
//entityManagerFactoryBean.setJpaVendorAdapter(vendorAdapter);
entityManagerFactoryBean.setJpaProperties(hibernateProperties());
entityManagerFactoryBean.afterPropertiesSet();
entityManagerFactoryBean.setLoadTimeWeaver(new InstrumentationLoadTimeWeaver());
return entityManagerFactoryBean;
}
@Primary
@Bean(name = "agTransactionManager")
public PlatformTransactionManager agTransactionManager() {
final JpaTransactionManager transactionManager = new JpaTransactionManager();
try {
transactionManager.setEntityManagerFactory(agEntityManagerFactory().getObject());
transactionManager.setDataSource(agDataSource());
transactionManager.setJpaDialect(new HibernateJpaDialect());
//transactionManager.setNestedTransactionAllowed(true);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
return transactionManager;
}
最佳答案
我可以通过在数据源对象本身上设置连接池属性来解决该问题。我认为 hibernate 属性无法反射(reflect)池设置。我可以通过在 mysql 的 my.ini 文件中设置 wait_timeout=60、interactive_timeout=60(即 1 分钟)来在开发环境中复制该问题。然后在服务器启动后，我尝试了第一个事务，等待了 1 分钟，然后尝试了失败的 txn。然后我启用了查询日志(通过在 my.ini 中设置另外两个属性:
general_log = 1
general_log_file = "C:/xampp/mysql/data/mysql.log"
我启用了上述设置来检查我的select 1验证查询是否正在执行。我尝试了数据源对象本身的池设置，它开始工作。查询日志还显示每 hibernate.c3p0.idle_test_period 秒执行一次 selec 1。
@Primary
@Bean
public DataSource agDataSource() {
ComboPooledDataSource dataSource = new ComboPooledDataSource();
try {
dataSource.setDriverClass(environment.getRequiredProperty("hibernate.connection.driver_class"));
} catch (IllegalStateException | PropertyVetoException e) {
e.printStackTrace();
}
dataSource.setJdbcUrl(environment.getRequiredProperty("hibernate.connection.url"));
dataSource.setUser(environment.getRequiredProperty("hibernate.connection.username"));
dataSource.setPassword(environment.getRequiredProperty("hibernate.connection.password"));
dataSource.setMaxPoolSize(Integer.parseInt(environment.getRequiredProperty("hibernate.c3p0.max_size")));
dataSource.setMinPoolSize(Integer.parseInt(environment.getRequiredProperty("hibernate.c3p0.min_size")));
dataSource.setMaxIdleTime(Integer.parseInt(environment.getRequiredProperty("hibernate.c3p0.timeout")));
dataSource.setMaxStatements(Integer.parseInt(environment.getRequiredProperty("hibernate.c3p0.max_statements")));
dataSource.setIdleConnectionTestPeriod(Integer.parseInt(environment.getRequiredProperty("hibernate.c3p0.idle_test_period")));
dataSource.setAcquireIncrement(Integer.parseInt(environment.getRequiredProperty("hibernate.c3p0.acquire_increment")));
dataSource.setPreferredTestQuery(environment.getRequiredProperty("hibernate.c3p0.preferredTestQuery"));
dataSource.setTestConnectionOnCheckin(true);
dataSource.setTestConnectionOnCheckout(true);
return dataSource;
}
现在一切正常了。快乐的。我发布了答案以及验证我的设置的步骤，以便对其他人有所帮助。
关于java - 带有 c3p0 的 spring JPA 在第一次请求时连接超时，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/40671930/